This is one I don't share with the kids:

Knock knock.
Who's there?
Anita.
Anita who?
Anita get laid!

(sorry GEL )

My S8 is our comedian. he makes up about half his material, 75% of which doesn't make a lot of sense, but he thinks is hysterical. It is kinda funny to watch though. I have shared a modified Anita knock knock with him...Anita drink!